Provide an appropriate response.
Jim can paint a house in 5 days. Joe paints the same house in 7 days. Marvin takes 9 days to do the job. How long will take if all three work together to paint 2 houses of the same size?
A. 4.4 days
B. 3.4 days
C. 21 days
D. 2.2 days
Answer: A
Mathematics
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